Circuit Breakers

Part Number	Description / PDF	Quantity
GMS-32H 1.6A Carlo Gavazzi	MMS 32A HIGH BREAK 1-1.6A	5
GMS-32H 2.5A Carlo Gavazzi	MMS 32A HIGH BREAK 1.6-2.5A	4
GSB631PC25 Carlo Gavazzi	MCB UL1077 C 1P 25A	19
GMS-100S 90A Carlo Gavazzi	MMS 100A STD BREAK 70-90A	3
GMB631PC4 Carlo Gavazzi	CIR BRK THRM-MAG 4A 240VAC/60VDC	11
GMS-63S 26A Carlo Gavazzi	MMS 63A STD BREAK 18-26A	3
GMS-32H 32A Carlo Gavazzi	MMS 32A HIGH BREAK 22-32A	16
GMB63H1PC32 Carlo Gavazzi	MCB HV UL489 C 1P 32A LUG T	21
GMB63H1PC1 Carlo Gavazzi	CIR BRKR THERM-MAG 1A 480/277V	8
GMB633PC8 Carlo Gavazzi	CIR BRKR THERM-MAG 8A 240VAC	4
GMB633PC4 Carlo Gavazzi	CIR BRKR THERM-MAG 4A 240VAC	3
GSB631PC40 Carlo Gavazzi	MCB UL1077 C 1P 40A	25
GMB63H2PC32 Carlo Gavazzi	MCB HV UL489 C 2P 32A LUG T	24
GSB632PC10 Carlo Gavazzi	MCB UL1077 C 2P 10A	22
GMB63H2PC3 Carlo Gavazzi	CIR BRKR THERM-MAG 3A 480/277V	6
GMB63H2PC4 Carlo Gavazzi	CIR BRKR THERM-MAG 4A 480/277V	2
GSB633PC2 Carlo Gavazzi	MCB UL1077 C 3P 2A	1
GMB632PC1.6 Carlo Gavazzi	CIR BRK THERM 1.6A 240VAC/125VDC	5
GMB63H2PC0.5 Carlo Gavazzi	CIR BRKR THERM-MAG 0.5A 480/277V	0
GSB632PC50 Carlo Gavazzi	MCB UL1077 C 2P 50A	22

Circuit Breakers

1. Overview

Circuit breakers are automatic electrical switches designed to protect circuits from damage caused by overloads or short circuits. Unlike fuses, they can be reset after tripping. Modern circuit breakers ensure electrical safety, prevent equipment damage, and maintain system reliability in residential, commercial, and industrial applications.

2. Main Types and Functional Classification

Type	Function Features	Application Examples
MCB (Miniature Circuit Breaker)	Thermal-magnetic protection, <100A rating	Residential wiring, lighting circuits
MCCB (Molded Case Circuit Breaker)	Adjustable trip settings, 10-2500A rating	Industrial machinery, HVAC systems
ACB (Air Circuit Breaker)	High fault current interruption, 400-6300A rating	Power distribution in data centers
RCCB (Residual Current Circuit Breaker)	Earth leakage protection (5-500mA sensitivity)	Outdoor outlets, swimming pool equipment
RCBO (Residual Current Breaker with Overcurrent)	Combines overload, short-circuit, and leakage protection	Hospital equipment, construction sites

3. Structure and Components

Typical components include: - Enclosure: Flame-retardant insulating material housing - Contacts: Silver alloy for high conductivity - Trip Mechanism: Bimetallic strip (thermal) and electromagnetic coil (magnetic) - Arc Extinguisher: Multi-plate chamber for arc suppression - Operating Lever: Manual ON/OFF control with position indicators

4. Key Technical Parameters

Parameter	Description	Importance
Rated Current (In)	Maximum continuous current without tripping	Determines load capacity
Rated Voltage (Un)	Maximum operating voltage	Ensures insulation safety
Breaking Capacity (Icu)	Maximum fault current interrupting capability	Prevents catastrophic failure
Tripping Characteristics	Time-current curve (B/C/D types)	Matches load requirements
Pole Number	1P to 4P configurations	Determines phase protection

5. Application Fields

Power distribution: Residential panels, commercial switchboards
Industrial equipment: Motors, transformers, CNC machines
Renewable energy: Solar inverters, wind turbine systems
Transportation: EV charging stations, rail traction systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Schneider Electric	Acti 9 series	Modular design, 0.5-125A range
Siemens	5SJ series	High short-circuit withstand, DIN rail mount
ABB	Emax series	Smart connectivity, up to 6300A
General Electric	THQL series	UL-certified, industrial motor protection

7. Selection Guidelines

Key considerations: - Match rated current to load requirements (125% safety margin) - Select tripping curve (Type B for resistive loads, C for motors) - Verify breaking capacity against system fault levels - Consider environmental factors (temperature, altitude) - Ensure compliance with standards (IEC 60898, UL 489) - Example: For a 20kW motor (400V), select MCCB with 63A rating, Type C curve, 50kA breaking capacity

8. Industry Trends

Emerging trends include: - Smart grid integration with IoT-enabled monitoring - Compact designs for space-constrained applications - Eco-friendly materials with halogen-free construction - Integration with renewable energy systems - Predictive maintenance via AI-powered diagnostics - Increased adoption of DC circuit breakers for EV infrastructure